.header{
    width: 100%;
    height: 40px;
    background-color: #26A2FF;
    text-align: center;
    line-height: 40px;
    margin-bottom: 5px;
    position: fixed;
    color: #fff;
    top: 0;
    z-index: 10
}
.content{
	margin-top: 45px;
	overflow: hidden;
	padding-bottom: 50px;
}
.nav{
	position: fixed;
	z-index: 10;
	bottom: 0;
	width: 100%;
	height: 50px;
	border-top: 1px solid #999;
	padding-top: 3px;
	background-color: #fff;
}
.nav span{
	font-size: 20px;
}
.nav a{
	width: 25%;
	float: left;
	text-align: center;
	height: 100%;
}
/* 当哪个页面正在被访问是需要把当前导航图标变成蓝色 */
.nav .blue{
	color:#007aff;
}









